TDLAS (tunable diode laser absorption spectroscopy) optical measurement structure for fan-shaped combustion chamber outlet

Abstract

The invention relates to the technical field of aero-engine detection, in particular to a TDLAS (tunable diode laser absorption spectroscopy) optical measurement structure for an outlet of a fan-shaped combustion chamber, which comprises a water cooling barrel, an inlet flange and an outlet flange, the water-cooling barrel comprises an outer-layer barrel and an inner-layer barrel which form an interlayer water cavity for introducing circulating cooling water; a probe mounting seat and a plurality of optical mounting seats are inserted into the water cooling cylinder; the TDLAS optical assembly is inserted into a center hole of the optical mounting seat; the TDLAS optical assembly comprises a plugging block body, sapphire glass, a pressing cylinder, a first connector used for introducing high-pressure nitrogen to purge the sapphire glass and a second connector used for introducing low-pressure nitrogen to purge air in the pressing cylinder, the sapphire glass is arranged in a center hole of the plugging block body, and the pressing cylinder is used for pressing the sapphire glass into the plugging block body; the pressing cylinder is provided with a through central hole to form a light path measuring channel; and the probe mounting seat is used for mounting the contact type total temperature and total pressure composite sensing head.

Description

Technical Field

[0001] This invention relates to the field of aero-engine testing technology, and in particular to a TDLAS optical measurement structure for the outlet of a fan-shaped combustion chamber. Background Technology

[0002] Combustion chamber outlet temperature is an important reference for evaluating the performance of aero-engines, and the need to advance technological development has placed increasingly higher demands on the measurement of aero-engine combustion chamber outlet temperature.

[0003] However, current research on contact measurement of aero-engine combustor outlet temperature is relatively extensive, and the measurement structure is easy to implement. Research on non-contact measurement of aero-engine fan-shaped combustor outlet temperature is still limited. TDLAS technology, as a non-contact measurement technique, has advantages such as low detection limit, high sensitivity, fast response speed, and non-invasiveness. It has been widely applied in near-infrared trace gas detection, industrial production and motor vehicle pollutant emission monitoring, combustion diagnosis of coal-fired boilers, and component concentration detection. However, its application in measuring the outlet temperature of high-pressure, high-temperature fan-shaped combustors is less studied.

[0004] Currently, the design of TDLAS optical high-temperature measurement structures for the fan-shaped combustor outlet of aero-engines needs to consider the challenges of withstanding the high temperature and pressure of the combustion gases at the combustor outlet, as well as the issues of gas leakage in the optical measurement channel and incomplete combustion leading to carbon buildup and contamination of the optical glass. Therefore, a measurement structure with excellent temperature and pressure resistance is required for TDLAS optical high-temperature measurement tests at the fan-shaped combustor outlet to ensure that the optical measurement channel remains uncontaminated and that the measured test data is accurate and valid. Summary of the Invention

[0005] The main objective of this invention is to propose a TDLAS optical measurement structure for the outlet of a fan-shaped combustion chamber, aiming to solve the aforementioned technical problems.

[0006] To achieve the above objectives, this invention proposes a TDLAS optical measurement structure for a fan-shaped combustion chamber outlet, comprising a water-cooled cylinder, a TDLAS optical assembly, and inlet and outlet flanges welded to both ends of the water-cooled cylinder; the water-cooled cylinder includes an outer cylinder and an inner cylinder, with a sandwiched water cavity formed between the outer and inner cylinders for circulating cooling water; a probe mounting base and multiple optical mounting bases are inserted into the water-cooled cylinder, the probe mounting base and optical mounting bases respectively penetrating the outer and inner cylinders; The TDLAS optical component is inserted into the central hole of the optical mounting base; the TDLAS optical component includes a plug body, sapphire glass, a pressure cylinder, a first connector for introducing high-pressure nitrogen to purge the sapphire glass, and a second connector for introducing low-pressure nitrogen to purge the air inside the pressure cylinder. The sapphire glass is disposed in the central hole of the plug body, and the pressure cylinder is used to press the sapphire glass tightly into the plug body; the pressure cylinder is provided with a through-hole to form an optical path measurement channel; the probe mounting base is used to install a contact-type total temperature and total pressure composite sensor.

[0007] Preferably, the pressure of the high-pressure nitrogen gas introduced through the first connector is 2.1 MPa, and the pressure of the low-pressure nitrogen gas introduced through the second connector is 200 kPa.

[0008] Preferably, the block body includes, from top to bottom, a cylindrical platform, a block body, and a plug-in post; the plug-in post is inserted into the central hole of the optical mounting base; a copper washer is embedded on the bottom surface of the block body; screw through holes are provided at the four corners of the block body; the block body and the optical mounting base are connected by four hexagon socket screws, and the copper washer abuts against the top surface of the optical mounting base to form a seal.

[0009] Preferably, three M5 internal thread interfaces are provided on the top surface of the cylindrical platform for screw connection with the fiber optic probe.

[0010] Preferably, a vertical vent hole is provided on the side wall of the plug, and a first horizontal vent hole is provided at the first end of the block; a first connecting pipe is installed at the first end of the block; a first connector is installed on the first connecting pipe; the central hole of the first connector, the through hole in the first connecting pipe, the first horizontal vent hole, and the vertical vent hole together form a high-pressure nitrogen channel; an end cap is installed at the lower end of the plug, and the end cap and the lower end face of the plug form a blowing slit; the blowing slit communicates with the vertical vent hole; the lower end face of the sapphire glass is flush with the lower end face of the plug; a guide slope is provided on the end cap for guiding the high-pressure nitrogen blown out from the blowing slit.

[0011] Preferably, a second horizontal vent is formed at the second end of the block; the outlet end of the second horizontal vent extends through to the inner wall of the block body; a second connecting pipe is installed at the second end of the block, and a second connector is installed on the second connecting pipe; the center hole of the second connector, the through hole in the second connecting pipe, and the second horizontal vent together form a low-pressure nitrogen channel; the pressure cylinder includes an external thread section and a cylindrical section from top to bottom; an internal thread hole is provided at the upper part of the center hole of the block body and mates with the external thread section; a gas film hole is formed on the side wall of the cylindrical section, and the outer wall of the cylindrical section is spaced apart from the inner wall of the block body to form an annular cavity.

[0012] Preferably, the sapphire glass includes a cylindrical section, an upper boss integrally formed on the top surface of the cylindrical section, and a lower boss integrally formed on the lower surface of the cylindrical section; a first graphite washer is fitted on the upper boss, and a second graphite washer is fitted on the lower boss; the lower end face of the pressure cylinder abuts against the top surface of the first graphite washer; an annular limiting platform is provided at the lower end of the central hole of the plug body, the lower end face of the second graphite washer abuts against the top surface of the annular limiting platform, and the lower boss is inserted into the central hole of the annular limiting platform.

[0013] Preferably, the first graphite washer and the second graphite washer both have a specification of φ10×φ6 and a thickness of 2.5mm.

[0014] Preferably, the cross-sections of both the outer and inner cylinders are fan-shaped; the inlet flange and outlet flange are both fan-shaped; two water inlet pipe joints are welded on the inner arc-shaped sidewall of the outer cylinder; two water outlet pipe joints are welded on the outer arc-shaped sidewall of the outer cylinder; and the water inlet pipe joints and water outlet pipe joints are both connected to the interlayer water cavity.

[0015] Preferably, a flow guide plate assembly is provided within the interlayer water cavity; the flow guide plate assembly includes a first sector frame, a second sector frame, a third sector frame, and a fourth sector frame arranged sequentially from left to right; a notch is provided in the middle of the upper arc beam of the first sector frame; a notch is provided in the middle of the middle of the upper arc beam and the lower arc beam of the second sector frame; a notch is provided in the middle of the middle of the upper arc beam of the third sector frame; and a notch is provided in the middle of the middle of the lower arc beam of the fourth sector frame.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: A double-layered water chamber is formed between the outer and inner cylinders, through which circulating cooling water is introduced. Low-pressure nitrogen is used to purge the air inside the pressure cylinder, and high-pressure nitrogen is used to purge the end face of the sapphire glass. Therefore, the dual-path nitrogen purging design prevents the sapphire glass from being contaminated by water vapor, oil mist, and carbon ash, while also preventing gas leakage and erosion, eliminating interference from air components, and ensuring a clean optical path and measurement accuracy. The circulating water in the double-layered water chamber effectively cools the device, enabling it to withstand high-temperature and high-pressure conditions with a maximum outlet temperature of ≥2300K and a pressure of ≥2.0MPa in the fan-shaped combustion chamber, thus enabling engineering applications of TDLAS non-contact measurement under these conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a main cross-sectional view of the TDLAS optical measurement structure provided by the present invention.

[0019] Figure 2 for Figure 1 A cross-sectional view along CC.

[0020] Figure 3 This is a cross-sectional view of the TDLAS optical component in this invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the TDLAS optical component in this invention.

[0022] Figure 5 This is a schematic diagram of the sapphire glass structure in this invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the pressure cylinder in this invention.

[0024] Figure 7 This is a schematic diagram of the flow guide plate assembly in this invention.

[0025] Reference numerals: 1. Inlet flange; 2. Outlet pipe connector; 3. TDLAS optical assembly; 4. Optical mounting base; 5. Probe mounting base; 6. Water-cooled cylinder; 6a. Outer cylinder; 6b. Inner cylinder; 6c. Jacketed water cavity; 7. Outlet flange; 8. Baffle assembly; 8a. First sector frame; 8b. Second sector frame; 8c. Third sector frame; 8d. Fourth sector frame; 9. Inlet pipe connector; 10. Block body; 10a. Insert post; 10b. Block; 10c. Cylindrical body; 10d. Screw through hole; 10e. Internal thread interface; 10f. Vertical vent. ; 10g, First horizontal vent; 10h, Second horizontal vent; 10i, Annular limiting stage; 11, Sapphire glass; 11a, Column section; 11b, Upper boss; 11c, Lower boss; 12, Pressure cylinder; 12a, Air film hole; 12b, Optical path measurement channel; 12c, External thread section; 12d, Cylinder section; 13, First connector; 14, Second connector; 15, Copper washer; 16, First connecting pipe; 17, End cap; 17a, Guide slope; 18, Air slit; 19, Second connecting pipe; 20, Annular cavity; 21, First graphite washer; 22, Second graphite washer. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] Combination Figures 1 to 7As shown, a TDLAS optical measurement structure for a sector-shaped combustion chamber outlet includes a water-cooled cylinder 6, a TDLAS optical component 3, and an inlet flange 1 and an outlet flange 7 welded to both ends of the water-cooled cylinder 6. The cross-sections of both the outer cylinder 6a and the inner cylinder 6b are sector-shaped; both the inlet flange 1 and the outlet flange 7 are sector-shaped. The inlet flange 1 and the outlet flange 7 are used to connect to the sector-shaped combustion chamber using M10 bolts.

[0030] Combination Figure 1 and Figure 2 As shown, the water-cooled cylinder 6 includes an outer cylinder 6a and an inner cylinder 6b, with a sandwiched water cavity 6c formed between the outer cylinder 6a and the inner cylinder 6b for circulating cooling water. In this embodiment, two inlet pipe joints 9 are welded to the inner arc-shaped sidewall of the outer cylinder 6a; two outlet pipe joints 2 are welded to the outer arc-shaped sidewall of the outer cylinder 6a; both the inlet pipe joints 9 and the outlet pipe joints 2 are connected to the sandwiched water cavity 6c, forming a "double inlet, double outlet" configuration. That is, cooling water enters the sandwiched water cavity 6c from the two inlet pipe joints 9 and then flows out from the two outlet pipe joints 2. Since the inlet pipe joints 9 and the outlet pipe joints 2 achieve "low inlet, high outlet" cooling water supply, the pressure difference of the circulating water is 0.4 MPa, and the purpose of circulating cooling water is to cool the main body of the measurement structure.

[0031] Combination Figure 1 and Figure 7 As shown, a flow guide plate assembly 8 is provided in the interlayer water cavity 6c; the flow guide plate assembly 8 includes a first sector frame 8a, a second sector frame 8b, a third sector frame 8c, and a fourth sector frame 8d arranged sequentially from left to right. A notch is provided in the middle of the upper arc beam of the first sector frame 8a.

[0032] The upper and lower arc beams of the second sector frame 8b both have notches in the middle.

[0033] A notch is provided in the middle of the upper arc-shaped beam of the third sector frame 8c.

[0034] A notch is provided in the middle of the lower arc-shaped beam of the fourth sector frame 8d.

[0035] The TDLAS optical measurement structure provided in this embodiment operates in a high-temperature environment of 2300K, requiring effective cooling design to ensure the reliability of the device. Since water has a much higher heat capacity than air, water has a stronger cooling capacity per unit volume flow rate than air and can be recycled; therefore, water cooling is employed for the main body of the measurement structure. A sandwiched water cavity 6c structure is used, with cooling water supplied via a "low inlet, high outlet" method. The flow area and resistance loss of the sandwiched water cavity 6c are limited by the various sector frames on the guide plate assembly 8 at each sector frame location to distribute the flow rate, effectively increasing the water flow velocity. This breaks the low-speed backflow zone, guiding the water flow along the hot wall surface and increasing the cooling and heat exchange effect of the hot wall surface. The notches on different sector frames break the low-speed backflow zone, guiding the water flow along the hot wall surface, enhancing the cooling and heat exchange effect, and ensuring stable operation of the structure at temperatures above 2300K.

[0036] The probe mounting base 5 and the optical mounting base 4 penetrate the outer cylinder 6a and the inner cylinder 6b, respectively; the TDLAS optical component 3 is inserted into the central hole of the optical mounting base 4. The probe mounting base 5 and the optical mounting base 4 are respectively provided with an insertion section and a limiting section. The insertion section penetrates the outer cylinder 6a and the inner cylinder 6b, and its inner end is welded to the inner cylinder 6b. The central holes of the probe mounting base 5 and the optical mounting base 4 communicate with the fan-shaped through hole in the center of the inner cylinder 6b. The limiting section on the probe mounting base 5 and the optical mounting base 4 abuts against the outer wall surface of the outer cylinder 6a and is welded. The welding is done by full welding to prevent leakage from the interlayer water cavity 6c.

[0037] The probe mounting base 5 is used to install a contact-type total temperature and total pressure composite sensor, which is used to measure the total temperature and total pressure of the airflow through the fan-shaped through hole at the center of the inner cylinder 6b, so as to compare the results of contact measurement and TDLAS measurement and verify the validity of the data.

[0038] Combination Figure 3 and Figure 4 As shown, the TDLAS optical component 3 includes a block body 10, a sapphire glass 11, a pressure cylinder 12, a first connector 13 for introducing high-pressure nitrogen to purge the sapphire glass 11, and a second connector 14 for introducing low-pressure nitrogen to purge the air inside the pressure cylinder 12. The sapphire glass 11 is disposed in the central hole of the block body 10, and the pressure cylinder 12 is used to press the sapphire glass 11 tightly into the block body 10. The pressure cylinder 12 is provided with a through-hole to form an optical path measurement channel 12b.

[0039] Specifically, the block body 10 includes, from top to bottom, a cylindrical platform 10c, a block body 10b, and a plug post 10a; the plug post 10a is inserted into the center hole of the optical mounting base 4; a copper washer 15 is embedded on the bottom surface of the block body 10b; screw through holes 10d are provided at the four corners of the block body 10b, the block body 10b is connected to the optical mounting base 4 by four hexagon socket screws, and the copper washer 15 abuts against the top surface of the optical mounting base 4 to form a seal.

[0040] Three M5 internal threaded interfaces 10e are provided on the top surface of the cylindrical platform 10c for screw connection with the fiber optic probe.

[0041] A vertical vent hole 10f is provided on the side wall of the insertion post 10a, and a first horizontal vent hole 10g is provided at the first end of the block body 10b; a first connecting pipe 16 is installed at the first end of the block body 10b; a first connector 13 is installed on the first connecting pipe 16; the central hole of the first connector 13, the through hole in the first connecting pipe 16, the first horizontal vent hole 10g, and the vertical vent hole 10f together form a high-pressure nitrogen channel; an end cap 17 is installed at the lower end of the insertion post 10a, and the end cap 17 and the lower end face of the insertion post 10a form a blowing slit 18; the blowing slit 18 communicates with the vertical vent hole 10f; the lower end face of the sapphire glass 11 is flush with the lower end face of the insertion post 10a; a guide slope 17a is provided on the end cap 17 to guide the high-pressure nitrogen blown out of the blowing slit 18. In this embodiment, the height of the blowing slit 18 is 0.5mm.

[0042] A second horizontal vent 10g is opened at the second end of the block 10b; the outlet end of the second horizontal vent 10g extends through the inner wall of the block body 10; a second connecting pipe 19 is installed at the second end of the block 10b, and a second connector 14 is installed on the second connecting pipe 19; the center hole of the second connector 14, the through hole in the second connecting pipe 19, and the second horizontal vent 10g together form a low-pressure nitrogen channel.

[0043] The pressure cylinder 12 includes an external thread section 12c and a cylindrical section 12d from top to bottom; the upper part of the center hole of the plug body 10 is provided with an internal thread hole that mates with the external thread section 12c; an air film hole 12a is provided on the side wall of the cylindrical section 12d; the outer wall of the cylindrical section 12d is spaced apart from the inner wall of the plug body 10 to form an annular cavity 20.

[0044] By adopting the above structure, when in use, high-pressure nitrogen gas with a pressure of 2.1 MPa is introduced into the first connector 13, and low-pressure nitrogen gas with a pressure of 200 kPa is introduced into the second connector 14.

[0045] Combination Figure 3 As shown, high-pressure nitrogen enters the high-pressure nitrogen channel from the first connector 13 and is then ejected from the blowing slit 18, thereby purging the lower end face of the sapphire glass 11. After the high-pressure nitrogen purges the lower end face of the sapphire glass 11, it comes into contact with the gas in the fan-shaped through hole of the inner cylinder 6b under the guiding action of the guide slope 17a, which can effectively solve the problems of gas erosion and leakage.

[0046] In addition, low-pressure nitrogen enters the low-pressure nitrogen channel from the second connector 14, and then enters the annular cavity 20 between the outer wall of the cylinder section 12d and the inner wall of the block body 10. Then, it enters the central hole of the pressure cylinder 12 through the gas film hole 12a, that is, the low-pressure nitrogen enters the optical path measurement channel 12b to purge the air in the optical path measurement channel 12b and avoid the presence of H2O in the optical path measurement channel 12 from affecting the measurement data.

[0047] Combination Figure 6 As shown, three rings of air film holes 12a are opened on the cylindrical section 12d. The diameter of the air film holes 12a is φ2mm, and there are six air film holes 12a in each ring.

[0048] In this embodiment, considering that incomplete combustion in the combustion chamber may cause the combustion gas to carry water vapor, oil mist, and carbon ash, contaminating the sapphire glass 11, resulting in severe scattering of the laser beam emitted by TDLAS when passing through the sapphire glass 11 and rendering it ineffective for measurement, the above problems are overcome by using high-pressure nitrogen and low-pressure nitrogen for purging, thus preventing the sapphire glass 11 from being contaminated.

[0049] Combination Figure 3 and Figure 5 As shown, the sapphire glass 11 includes a columnar section 11a, an upper boss 11b integrally formed on the top surface of the columnar section 11a, and a lower boss 11c integrally formed on the lower end surface of the columnar section 11a. A first graphite washer 21 is fitted on the upper boss 11b, and a second graphite washer 22 is fitted on the lower boss 11c.

[0050] The lower end face of the pressure cylinder 12 abuts against the top surface of the first graphite washer 21.

[0051] An annular limiting platform 10i is provided at the lower end of the central hole of the block body 10. The lower end face of the second graphite washer 22 abuts against the top surface of the annular limiting platform 10i, and the lower boss 11c is inserted into the central hole of the annular limiting platform 10i.

[0052] The first graphite gasket 21 and the second graphite gasket 22 serve as high-temperature seals, effectively preventing high-temperature and high-pressure gas leakage.

[0053] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A TDLAS optical measurement structure for a sector-shaped combustion chamber outlet, characterized in that, It includes a water-cooled cylinder (6), a TDLAS optical component (3), and an inlet flange (1) and an outlet flange (7) welded to both ends of the water-cooled cylinder (6); The water-cooled cylinder (6) includes an outer cylinder (6a) and an inner cylinder (6b), and a sandwich water cavity (6c) is formed between the outer cylinder (6a) and the inner cylinder (6b) for circulating cooling water to be introduced; A probe mounting base (5) and multiple optical mounting bases (4) are inserted into the water-cooled cylinder (6), and the probe mounting base (5) and the optical mounting bases (4) penetrate the outer cylinder (6a) and the inner cylinder (6b) respectively. The TDLAS optical component (3) is inserted into the center hole of the optical mounting base (4); The TDLAS optical component (3) includes a block body (10), a sapphire glass (11), a pressure cylinder (12), a first connector (13) for introducing high-pressure nitrogen to purge the sapphire glass (11), and a second connector (14) for introducing low-pressure nitrogen to purge the air inside the pressure cylinder (12). The sapphire glass (11) is disposed in the central hole of the block body (10), and the pressure cylinder (12) is used to press the sapphire glass (11) tightly into the block body (10). The pressure cylinder (12) is provided with a through-hole to form an optical path measurement channel (12b). The probe mounting base (5) is used to install a contact-type total temperature and total pressure composite sensor.

2. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 1, characterized in that, The high-pressure nitrogen gas introduced through the first connector (13) is 2.1 MPa, and the low-pressure nitrogen gas introduced through the second connector (14) is 200 kPa.

3. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 1, characterized in that, The block body (10) includes, from top to bottom, a cylindrical platform (10c), a block (10b), and a plug (10a); the plug (10a) is inserted into the center hole of the optical mounting base (4); A copper washer (15) is inlaid on the bottom surface of the block (10b). Screw holes (10d) are provided at the four corners of the block (10b). The block (10b) is connected to the optical mounting base (4) by four hexagon socket screws, and the copper washer (15) abuts against the top surface of the optical mounting base (4) to form a seal.

4. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 3, characterized in that, Three M5 internal threaded interfaces (10e) are provided on the top surface of the cylindrical platform (10c) for screw connection with the fiber optic probe.

5. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 3, characterized in that, A vertical vent hole (10f) is provided on the side wall of the plug (10a), and a first horizontal vent hole (10g) is provided at the first end of the block (10b). A first connecting pipe (16) is installed at the first end of the block (10b); the first connector (13) is installed on the first connecting pipe (16); The central hole of the first connector (13), the through hole in the first connecting pipe (16), the first horizontal vent (10g), and the vertical vent (10f) together form a high-pressure nitrogen channel; An end cap (17) is installed at the lower end of the plug (10a), and the end cap (17) and the lower end face of the plug (10a) form an air slit (18); the air slit (18) communicates with the vertical vent (10f); The lower end face of the sapphire glass (11) is flush with the lower end face of the insertion post (10a); A guide slope (17a) is provided on the end cap (17) to guide the high-pressure nitrogen gas blown out from the air slit (18).

6. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 3, characterized in that, A second horizontal vent (10g) is opened at the second end of the block (10b); the outlet end of the second horizontal vent (10g) extends through the inner wall of the block body (10); A second connecting pipe (19) is installed at the second end of the block (10b), and the second connector (14) is installed on the second connecting pipe (19); The central hole of the second connector (14), the through hole in the second connecting pipe (19), and the second horizontal vent (10h) together form a low-pressure nitrogen channel; The pressure cylinder (12) includes an external thread section (12c) and a cylinder section (12d) from top to bottom; the upper part of the center hole of the plug body (10) is provided with an internal thread hole and cooperates with the external thread section (12c); An air film hole (12a) is provided on the side wall of the cylindrical section (12d), and the outer wall of the cylindrical section (12d) and the inner wall of the block body (10) are spaced apart to form an annular cavity (20).

7. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 1, characterized in that, The sapphire glass (11) includes a columnar section (11a), an upper boss (11b) integrally formed on the top surface of the columnar section (11a), and a lower boss (11c) integrally formed on the lower surface of the columnar section (11a). A first graphite washer (21) is fitted on the upper boss (11b), and a second graphite washer (22) is fitted on the lower boss (11c). The lower end face of the pressure cylinder (12) abuts against the top surface of the first graphite gasket (21); An annular limiting platform (10i) is provided at the lower end of the central hole of the block body (10). The lower end face of the second graphite gasket (22) abuts against the top surface of the annular limiting platform (10i), and the lower boss (11c) is inserted into the central hole of the annular limiting platform (10i).

8. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 7, characterized in that, The first graphite washer (21) and the second graphite washer (22) are both φ10×φ6 and 2.5mm thick.

9. The TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 1, characterized in that, The cross-sections of the outer cylinder (6a) and the inner cylinder (6b) are both fan-shaped; the inlet flange (1) and the outlet flange (7) are both fan-shaped. Two water inlet pipe joints (9) are welded on the inner arc-shaped sidewall of the outer cylinder (6a); two water outlet pipe joints (2) are welded on the outer arc-shaped sidewall of the outer cylinder (6a). The inlet pipe connector (9) and outlet pipe connector (2) are both connected to the interlayer water cavity (6c).

10. A TDLAS optical measurement structure for a sector-shaped combustion chamber outlet according to claim 1, characterized in that, A flow guide plate assembly (8) is provided inside the interlayer water cavity (6c); The deflector assembly (8) includes a first sector frame (8a), a second sector frame (8b), a third sector frame (8c), and a fourth sector frame (8d) arranged sequentially from left to right. A notch is provided in the middle of the upper arc beam of the first sector frame (8a); The upper and lower arc beams of the second sector frame (8b) are both provided with notches in the middle. The upper arc beam of the third sector frame (8c) has a notch in the middle; The lower arc beam of the fourth sector frame (8d) has a notch in the middle.

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